1#ifndef _LINUX_VIRTIO_H
2#define _LINUX_VIRTIO_H
3
4
5#include <linux/types.h>
6#include <linux/scatterlist.h>
7#include <linux/spinlock.h>
8#include <linux/device.h>
9#include <linux/mod_devicetable.h>
10#include <linux/gfp.h>
11#include <linux/vringh.h>
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27struct virtqueue {
28 struct list_head list;
29 void (*callback)(struct virtqueue *vq);
30 const char *name;
31 struct virtio_device *vdev;
32 unsigned int index;
33 unsigned int num_free;
34 void *priv;
35};
36
37int virtqueue_add_outbuf(struct virtqueue *vq,
38 struct scatterlist sg[], unsigned int num,
39 void *data,
40 gfp_t gfp);
41
42int virtqueue_add_inbuf(struct virtqueue *vq,
43 struct scatterlist sg[], unsigned int num,
44 void *data,
45 gfp_t gfp);
46
47int virtqueue_add_sgs(struct virtqueue *vq,
48 struct scatterlist *sgs[],
49 unsigned int out_sgs,
50 unsigned int in_sgs,
51 void *data,
52 gfp_t gfp);
53
54bool virtqueue_kick(struct virtqueue *vq);
55
56bool virtqueue_kick_prepare(struct virtqueue *vq);
57
58bool virtqueue_notify(struct virtqueue *vq);
59
60void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
61
62void virtqueue_disable_cb(struct virtqueue *vq);
63
64bool virtqueue_enable_cb(struct virtqueue *vq);
65
66unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq);
67
68bool virtqueue_poll(struct virtqueue *vq, unsigned);
69
70bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
71
72void *virtqueue_detach_unused_buf(struct virtqueue *vq);
73
74unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
75
76bool virtqueue_is_broken(struct virtqueue *vq);
77
78const struct vring *virtqueue_get_vring(struct virtqueue *vq);
79dma_addr_t virtqueue_get_desc_addr(struct virtqueue *vq);
80dma_addr_t virtqueue_get_avail_addr(struct virtqueue *vq);
81dma_addr_t virtqueue_get_used_addr(struct virtqueue *vq);
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87static inline void *virtqueue_get_desc(struct virtqueue *vq)
88{
89 return virtqueue_get_vring(vq)->desc;
90}
91static inline void *virtqueue_get_avail(struct virtqueue *vq)
92{
93 return virtqueue_get_vring(vq)->avail;
94}
95static inline void *virtqueue_get_used(struct virtqueue *vq)
96{
97 return virtqueue_get_vring(vq)->used;
98}
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115struct virtio_device {
116 int index;
117 bool config_enabled;
118 bool config_change_pending;
119 spinlock_t config_lock;
120 bool failed;
121 struct device dev;
122 struct virtio_device_id id;
123 const struct virtio_config_ops *config;
124 const struct vringh_config_ops *vringh_config;
125 struct list_head vqs;
126 u64 features;
127 void *priv;
128};
129
130static inline struct virtio_device *dev_to_virtio(struct device *_dev)
131{
132 return container_of(_dev, struct virtio_device, dev);
133}
134
135int register_virtio_device(struct virtio_device *dev);
136void unregister_virtio_device(struct virtio_device *dev);
137
138void virtio_break_device(struct virtio_device *dev);
139
140void virtio_config_changed(struct virtio_device *dev);
141#ifdef CONFIG_PM_SLEEP
142int virtio_device_freeze(struct virtio_device *dev);
143int virtio_device_restore(struct virtio_device *dev);
144#endif
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159struct virtio_driver {
160 struct device_driver driver;
161 const struct virtio_device_id *id_table;
162 const unsigned int *feature_table;
163 unsigned int feature_table_size;
164 const unsigned int *feature_table_legacy;
165 unsigned int feature_table_size_legacy;
166 int (*probe)(struct virtio_device *dev);
167 void (*scan)(struct virtio_device *dev);
168 void (*remove)(struct virtio_device *dev);
169 void (*config_changed)(struct virtio_device *dev);
170#ifdef CONFIG_PM
171 int (*freeze)(struct virtio_device *dev);
172 int (*restore)(struct virtio_device *dev);
173#endif
174};
175
176static inline struct virtio_driver *drv_to_virtio(struct device_driver *drv)
177{
178 return container_of(drv, struct virtio_driver, driver);
179}
180
181int register_virtio_driver(struct virtio_driver *drv);
182void unregister_virtio_driver(struct virtio_driver *drv);
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189#define module_virtio_driver(__virtio_driver) \
190 module_driver(__virtio_driver, register_virtio_driver, \
191 unregister_virtio_driver)
192#endif
193